#436 support insert multi

@@ -51,7 +51,13 @@ type dbBase struct {
 
 var _ dbBaser = new(dbBase)
 
-func (d *dbBase) collectValues(mi *modelInfo, ind reflect.Value, cols []string, skipAuto bool, insert bool, tz *time.Location) (columns []string, values []interface{}, err error) {
+func (d *dbBase) collectValues(mi *modelInfo, ind reflect.Value, cols []string, skipAuto bool, insert bool, names *[]string, tz *time.Location) (values []interface{}, err error) {
+	var columns []string
+
+	if names != nil {
+		columns = *names
+	}
+
 	for _, column := range cols {
 		var fi *fieldInfo
 		if fi, _ = mi.fields.GetByAny(column); fi != nil {
@@ -64,11 +70,20 @@ func (d *dbBase) collectValues(mi *modelInfo, ind reflect.Value, cols []string,
 		}
 		value, err := d.collectFieldValue(mi, fi, ind, insert, tz)
 		if err != nil {
-			return nil, nil, err
+			return nil, err
 		}
-		columns = append(columns, column)
+
+		if names != nil {
+			columns = append(columns, column)
+		}
+
 		values = append(values, value)
 	}
+
+	if names != nil {
+		*names = columns
+	}
+
 	return
 }
 
@@ -166,7 +181,7 @@ func (d *dbBase) PrepareInsert(q dbQuerier, mi *modelInfo) (stmtQuerier, string,
 }
 
 func (d *dbBase) InsertStmt(stmt stmtQuerier, mi *modelInfo, ind reflect.Value, tz *time.Location) (int64, error) {
-	_, values, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, tz)
+	values, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, nil, tz)
 	if err != nil {
 		return 0, err
 	}
@@ -192,7 +207,8 @@ func (d *dbBase) Read(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.Lo
 	// if specify cols length > 0, then use it for where condition.
 	if len(cols) > 0 {
 		var err error
-		whereCols, args, err = d.collectValues(mi, ind, cols, false, false, tz)
+		whereCols = make([]string, 0, len(cols))
+		args, err = d.collectValues(mi, ind, cols, false, false, &whereCols, tz)
 		if err != nil {
 			return err
 		}
@@ -202,7 +218,7 @@ func (d *dbBase) Read(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.Lo
 		if ok == false {
 			return ErrMissPK
 		}
-		whereCols = append(whereCols, pkColumn)
+		whereCols = []string{pkColumn}
 		args = append(args, pkValue)
 	}
 
@@ -244,15 +260,72 @@ func (d *dbBase) Read(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.Lo
 }
 
 func (d *dbBase) Insert(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.Location) (int64, error) {
-	names, values, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, tz)
+	names := make([]string, 0, len(mi.fields.dbcols)-1)
+	values, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, &names, tz)
 	if err != nil {
 		return 0, err
 	}
 
-	return d.InsertValue(q, mi, names, values)
+	return d.InsertValue(q, mi, false, names, values)
+}
+
+func (d *dbBase) InsertMulti(q dbQuerier, mi *modelInfo, sind reflect.Value, bulk int, tz *time.Location) (int64, error) {
+	var (
+		cnt    int64
+		nums   int
+		values []interface{}
+		names  []string
+	)
+
+	// typ := reflect.Indirect(mi.addrField).Type()
+
+	length := sind.Len()
+
+	for i := 1; i <= length; i++ {
+
+		ind := reflect.Indirect(sind.Index(i - 1))
+
+		// Is this needed ?
+		// if !ind.Type().AssignableTo(typ) {
+		// 	return cnt, ErrArgs
+		// }
+
+		if i == 1 {
+			vus, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, &names, tz)
+			if err != nil {
+				return cnt, err
+			}
+			values = make([]interface{}, bulk*len(vus))
+			nums += copy(values, vus)
+
+		} else {
+
+			vus, err := d.collectValues(mi, ind, mi.fields.dbcols, true, true, nil, tz)
+			if err != nil {
+				return cnt, err
+			}
+
+			if len(vus) != len(names) {
+				return cnt, ErrArgs
+			}
+
+			nums += copy(values[nums:], vus)
+		}
+
+		if i > 1 && i%bulk == 0 || length == i {
+			num, err := d.InsertValue(q, mi, true, names, values[:nums])
+			if err != nil {
+				return cnt, err
+			}
+			cnt += num
+			nums = 0
+		}
+	}
+
+	return cnt, nil
 }
 
-func (d *dbBase) InsertValue(q dbQuerier, mi *modelInfo, names []string, values []interface{}) (int64, error) {
+func (d *dbBase) InsertValue(q dbQuerier, mi *modelInfo, isMulti bool, names []string, values []interface{}) (int64, error) {
 	Q := d.ins.TableQuote()
 
 	marks := make([]string, len(names))
@@ -264,21 +337,30 @@ func (d *dbBase) InsertValue(q dbQuerier, mi *modelInfo, names []string, values
 	qmarks := strings.Join(marks, ", ")
 	columns := strings.Join(names, sep)
 
+	multi := len(values) / len(names)
+
+	if isMulti {
+		qmarks = strings.Repeat(qmarks+"), (", multi-1) + qmarks
+	}
+
 	query := fmt.Sprintf("INSERT INTO %s%s%s (%s%s%s) VALUES (%s)", Q, mi.table, Q, Q, columns, Q, qmarks)
 
 	d.ins.ReplaceMarks(&query)
 
-	if d.ins.HasReturningID(mi, &query) {
-		row := q.QueryRow(query, values...)
-		var id int64
-		err := row.Scan(&id)
-		return id, err
-	} else {
+	if isMulti || !d.ins.HasReturningID(mi, &query) {
 		if res, err := q.Exec(query, values...); err == nil {
+			if isMulti {
+				return res.RowsAffected()
+			}
 			return res.LastInsertId()
 		} else {
 			return 0, err
 		}
+	} else {
+		row := q.QueryRow(query, values...)
+		var id int64
+		err := row.Scan(&id)
+		return id, err
 	}
 }
 
@@ -288,12 +370,17 @@ func (d *dbBase) Update(q dbQuerier, mi *modelInfo, ind reflect.Value, tz *time.
 		return 0, ErrMissPK
 	}
 
+	var setNames []string
+
 	// if specify cols length is zero, then commit all columns.
 	if len(cols) == 0 {
 		cols = mi.fields.dbcols
+		setNames = make([]string, 0, len(mi.fields.dbcols)-1)
+	} else {
+		setNames = make([]string, 0, len(cols))
 	}
 
-	setNames, setValues, err := d.collectValues(mi, ind, cols, true, false, tz)
+	setValues, err := d.collectValues(mi, ind, cols, true, false, &setNames, tz)
 	if err != nil {
 		return 0, err
 	}

@@ -214,8 +214,6 @@ loopFor:
 			fi, ok = mmi.fields.GetByAny(ex)
 		}
 
-		// fmt.Println(ex, fi.name, fiN)
-
 		_ = okN
 
 		if ok {

@@ -25,6 +25,7 @@ var (
 	ErrMultiRows     = errors.New("<QuerySeter> return multi rows")
 	ErrNoRows        = errors.New("<QuerySeter> no row found")
 	ErrStmtClosed    = errors.New("<QuerySeter> stmt already closed")
+	ErrArgs          = errors.New("<Ormer> args error may be empty")
 	ErrNotImplement  = errors.New("have not implement")
 )
 
@@ -39,11 +40,11 @@ type orm struct {
 
 var _ Ormer = new(orm)
 
-func (o *orm) getMiInd(md interface{}) (mi *modelInfo, ind reflect.Value) {
+func (o *orm) getMiInd(md interface{}, needPtr bool) (mi *modelInfo, ind reflect.Value) {
 	val := reflect.ValueOf(md)
 	ind = reflect.Indirect(val)
 	typ := ind.Type()
-	if val.Kind() != reflect.Ptr {
+	if needPtr && val.Kind() != reflect.Ptr {
 		panic(fmt.Errorf("<Ormer> cannot use non-ptr model struct `%s`", getFullName(typ)))
 	}
 	name := getFullName(typ)
@@ -62,7 +63,7 @@ func (o *orm) getFieldInfo(mi *modelInfo, name string) *fieldInfo {
 }
 
 func (o *orm) Read(md interface{}, cols ...string) error {
-	mi, ind := o.getMiInd(md)
+	mi, ind := o.getMiInd(md, true)
 	err := o.alias.DbBaser.Read(o.db, mi, ind, o.alias.TZ, cols)
 	if err != nil {
 		return err
@@ -71,25 +72,63 @@ func (o *orm) Read(md interface{}, cols ...string) error {
 }
 
 func (o *orm) Insert(md interface{}) (int64, error) {
-	mi, ind := o.getMiInd(md)
+	mi, ind := o.getMiInd(md, true)
 	id, err := o.alias.DbBaser.Insert(o.db, mi, ind, o.alias.TZ)
 	if err != nil {
 		return id, err
 	}
-	if id > 0 {
-		if mi.fields.pk.auto {
-			if mi.fields.pk.fieldType&IsPostiveIntegerField > 0 {
-				ind.Field(mi.fields.pk.fieldIndex).SetUint(uint64(id))
-			} else {
-				ind.Field(mi.fields.pk.fieldIndex).SetInt(id)
+
+	o.setPk(mi, ind, id)
+
+	return id, nil
+}
+
+func (o *orm) setPk(mi *modelInfo, ind reflect.Value, id int64) {
+	if mi.fields.pk.auto {
+		if mi.fields.pk.fieldType&IsPostiveIntegerField > 0 {
+			ind.Field(mi.fields.pk.fieldIndex).SetUint(uint64(id))
+		} else {
+			ind.Field(mi.fields.pk.fieldIndex).SetInt(id)
+		}
+	}
+}
+
+func (o *orm) InsertMulti(bulk int, mds interface{}) (int64, error) {
+	var cnt int64
+
+	sind := reflect.Indirect(reflect.ValueOf(mds))
+
+	switch sind.Kind() {
+	case reflect.Array, reflect.Slice:
+		if sind.Len() == 0 {
+			return cnt, ErrArgs
+		}
+	default:
+		return cnt, ErrArgs
+	}
+
+	if bulk <= 1 {
+		for i := 0; i < sind.Len(); i++ {
+			ind := sind.Index(i)
+			mi, _ := o.getMiInd(ind.Interface(), false)
+			id, err := o.alias.DbBaser.Insert(o.db, mi, ind, o.alias.TZ)
+			if err != nil {
+				return cnt, err
 			}
+
+			o.setPk(mi, ind, id)
+
+			cnt += 1
 		}
+	} else {
+		mi, _ := o.getMiInd(sind.Index(0).Interface(), false)
+		return o.alias.DbBaser.InsertMulti(o.db, mi, sind, bulk, o.alias.TZ)
 	}
-	return id, nil
+	return cnt, nil
 }
 
 func (o *orm) Update(md interface{}, cols ...string) (int64, error) {
-	mi, ind := o.getMiInd(md)
+	mi, ind := o.getMiInd(md, true)
 	num, err := o.alias.DbBaser.Update(o.db, mi, ind, o.alias.TZ, cols)
 	if err != nil {
 		return num, err
@@ -98,25 +137,19 @@ func (o *orm) Update(md interface{}, cols ...string) (int64, error) {
 }
 
 func (o *orm) Delete(md interface{}) (int64, error) {
-	mi, ind := o.getMiInd(md)
+	mi, ind := o.getMiInd(md, true)
 	num, err := o.alias.DbBaser.Delete(o.db, mi, ind, o.alias.TZ)
 	if err != nil {
 		return num, err
 	}
 	if num > 0 {
-		if mi.fields.pk.auto {
-			if mi.fields.pk.fieldType&IsPostiveIntegerField > 0 {
-				ind.Field(mi.fields.pk.fieldIndex).SetUint(0)
-			} else {
-				ind.Field(mi.fields.pk.fieldIndex).SetInt(0)
-			}
-		}
+		o.setPk(mi, ind, 0)
 	}
 	return num, nil
 }
 
 func (o *orm) QueryM2M(md interface{}, name string) QueryM2Mer {
-	mi, ind := o.getMiInd(md)
+	mi, ind := o.getMiInd(md, true)
 	fi := o.getFieldInfo(mi, name)
 
 	switch {
@@ -197,7 +230,7 @@ func (o *orm) QueryRelated(md interface{}, name string) QuerySeter {
 }
 
 func (o *orm) queryRelated(md interface{}, name string) (*modelInfo, *fieldInfo, reflect.Value, QuerySeter) {
-	mi, ind := o.getMiInd(md)
+	mi, ind := o.getMiInd(md, true)
 	fi := o.getFieldInfo(mi, name)
 
 	_, _, exist := getExistPk(mi, ind)

@@ -44,7 +44,8 @@ func (o *queryM2M) Add(mds ...interface{}) (int64, error) {
 
 	names := []string{mfi.column, rfi.column}
 
-	var nums int64
+	values := make([]interface{}, 0, len(models)*2)
+
 	for _, md := range models {
 
 		ind := reflect.Indirect(reflect.ValueOf(md))
@@ -59,16 +60,11 @@ func (o *queryM2M) Add(mds ...interface{}) (int64, error) {
 			}
 		}
 
-		values := []interface{}{v1, v2}
-		_, err := dbase.InsertValue(orm.db, mi, names, values)
-		if err != nil {
-			return nums, err
-		}
+		values = append(values, v1, v2)
 
-		nums += 1
 	}
 
-	return nums, nil
+	return dbase.InsertValue(orm.db, mi, true, names, values)
 }
 
 func (o *queryM2M) Remove(mds ...interface{}) (int64, error) {

@@ -21,6 +21,7 @@ type Fielder interface {
 type Ormer interface {
 	Read(interface{}, ...string) error
 	Insert(interface{}) (int64, error)
+	InsertMulti(int, interface{}) (int64, error)
 	Update(interface{}, ...string) (int64, error)
 	Delete(interface{}) (int64, error)
 	LoadRelated(interface{}, string, ...interface{}) (int64, error)
@@ -109,7 +110,8 @@ type txEnder interface {
 type dbBaser interface {
 	Read(dbQuerier, *modelInfo, reflect.Value, *time.Location, []string) error
 	Insert(dbQuerier, *modelInfo, reflect.Value, *time.Location) (int64, error)
-	InsertValue(dbQuerier, *modelInfo, []string, []interface{}) (int64, error)
+	InsertMulti(dbQuerier, *modelInfo, reflect.Value, int, *time.Location) (int64, error)
+	InsertValue(dbQuerier, *modelInfo, bool, []string, []interface{}) (int64, error)
 	InsertStmt(stmtQuerier, *modelInfo, reflect.Value, *time.Location) (int64, error)
 	Update(dbQuerier, *modelInfo, reflect.Value, *time.Location, []string) (int64, error)
 	Delete(dbQuerier, *modelInfo, reflect.Value, *time.Location) (int64, error)